Palpitation is a vague subjective term used when people feels the heart is going too fast in their chest.

May be normal or abnormal. It may be caused by caffeine, stimulants, medicines, bleeding, dehydration, real arrhythmias or diseases of the heart, fever, but it's very common in panic attacks or anxiety.
Would you like to video or text chat with me?

Someone with heart palpitations may experience a flutter in the left side of their chest, or a skipped beat, or a prolonged irregular rhythm, or prolonged fast or slow rhythm. Anything that is prolonged (ex:>5 min), or associated with chest pain, shortness of breath, dizziness, or loss of consciousness needs further evaluation, perhaps even in the er depending on the severity of symptoms.

In brief:
Varies

Someone with heart palpitations may experience a flutter in the left side of their chest, or a skipped beat, or a prolonged irregular rhythm, or prolonged fast or slow rhythm. Anything that is prolonged (ex:>5 min), or associated with chest pain, shortness of breath, dizziness, or loss of consciousness needs further evaluation, perhaps even in the er depending on the severity of symptoms.
Would you like to video or text chat with me?